Gulliver Seminar : Elena Govorun (Gulliver, ESPCI)

Lundi 15 mai de 11h30 à 12h30 - Bibliothèque PCT - F3.04

Self-assembly » of locally amphiphilic polymers

The capability of amphiphilic macromomecules to self-assemble in solutions and melts is used in different applications. Architecture of many thermosensitive polymers (as PNIPAm-based systems), biopolymers, and molecular brushes is locally amphiphilic, such polymers reveal a local surface activity and demonstrate a rich morphological behavior. In the talk, self-assembly of locally amphiphilic polymers is described using the dimer model of monomer units. In melts, microphase separation of diblock copolymers with amphiphilic blocks is analyzed. The interfacial tension decreases due to the surface activity of dimer units that considerably influence the phase diagrams. In solutions, collapsed states of amphiphilic homopolymers and diblock copolymers with hydrophobic and amphiphilic blocks are studied for single macromolecules and for micelles. In particular, the formation of thin-shell polymer vesicles is possible for moderate surface activity of amphiphilic monomer units.